Detailed Description

A global event filter for pre-processing all the events generated in the program.

This is a very simple class which just provides FilterEvent() virtual method to be called by wxEvtHandler before starting process of any event. Thus, inheriting from this class and overriding FilterEvent() allows to capture and possibly handle or ignore all the events happening in the program. Of course, having event filters adds additional overhead to every event processing and so should not be used lightly and your FilterEvent() code should try to return as quickly as possible, especially for the events it is not interested in.

An example of using this class:

// This class allows to determine the last time the user has worked with

Notice that wxApp derives from wxEventFilter and is registered as an event filter during its creation so you may also override FilterEvent() method in your wxApp-derived class and, in fact, this is often the most convenient way to do it. However creating a new class deriving directly from wxEventFilter allows to isolate the event filtering code in its own separate class and also to have several independent filters, if necessary.

Member Function Documentation

This method allows to filter all the events processed by the program, so you should try to return quickly from it to avoid slowing down the program to a crawl.

Although the return type of this method is int, this is only due to backwards compatibility concerns and the actual return value must be one of the Event_XXX constants defined above:

Event_Skip to continue processing the event normally (this should be used in most cases).

Event_Ignore to not process this event at all (this can be used to suppress some events).

Event_Processed to not process this event normally but indicate that it was already processed by the event filter and so no default processing should take place neither (this should only be used if the filter really did process the event).